致ち死し遺い伝でん子し

noun

lethal gene; lethal allele

Technical genetics term for a gene or allele that causes death of the organism, often before reproductive age.

• このマウス系けい統とうは致ち死し遺い伝でん子しを持もっているため、ホモ接せつ合ごう体たいは生うまれない。

  This mouse strain carries a lethal gene, so homozygotes are not born.